Plate 34. 



All figures from unretouched photographs of preserved specimens. 



Halicreas papillosum. 



Fig. 1. Oral view of about one-half the disc of an adult specimen, showing position of the 



gonads (go), radial canals, and exumbral papillae (p.ra). x 2. 

 Fig. 2. Portion of bell margin, with marginal organs, particularly to illustrate the 



difference in size between radial (t.ra), and adradial (ta.ra) tentacles; (era) 



radial canal ; (otc) otocyst. X 10. 

 Fig. 3. Oral view of an exumbral papilla (p.ra), showing its secondary projections ; (era) 



radial canal, x 5. 

 Fig. 4. Horaoeonema species (?) ; one octant of bell margin with marginal organs ; (t.r) 



radial tentacle ; (t.ira) interradial tentacle ; (otc) otocyst. X 20. 

 Fig. 5. Halicreas papillosum, distal portion of tentacle ; (en) chordate cells of endo- 



dermic core. X 40. 

 Fig. 6. Oral view of Homoeonema species (?) x 5. 



Tentacles of Halicreasidae. 



Fig. 7. Homoeonema species (?); tip of tentacle tliickly clothed with nematocysts. x 40. 



Fig. 8. Halicreas papillosum ; transition region between proximal and distal portions. 

 X40. 



Fig. 9. rtomoeonema alba, tentacle tip. x 40. 



Fig. 10. Halicreas papillosum, tentacle tip. X 40. 



Fig. 11. Halicreas papillosum, entire tentacle, showing differentiation into stout proxi- 

 mal, and slender spine-like distal portions, x 20. 



Amphogona apsteini. 

 Fig. 12. Transverse section through two adjacent gonads ; both female and containing 



large ova; (en) endoderm. x about 50. 

 Fig. 13. Otocyst. (Cf. Fig. 10, PI. 45.) x about 100. 

 Fig. 14. Margin, showing tentacle stumps, radial canals (era), and spherical gonads 



(go). X about 50. 

 Fig. 15. Manubrium and peduncle ; (era) radial canal, x 20. 



